[LTP] [PATCH 1/1] autoconf: Use pkg-config for keyutils detection

[Petr Vorel <pvorel@suse.cz>]

Hi Li,

> Hi Petr,

> Petr Vorel <pvorel@suse.cz> wrote:

> > > +
> > > > +AC_DEFUN([LTP_CHECK_LIBKEYUTILS], [
> > > > +    PKG_CHECK_MODULES([LIBKEYUTILS], [libkeyutils], [


> > > I guess the list-of-modules should be [keyutils-libs] but not
> > [libkeyutils]?
> > No problem to change that, but can you explain why?


> From what I understanding, this macro runs the pkg-config tool to check
> for the presence of packages against keyutils-libs and sets two variables:
> LIBKEYUTILS_CFLAGS, LIBKEYUTILS_LIBS accordingly.

> So the list-of-modules should be the precise name(or version) of the
> library, am I right?
> See: https://autotools.io/pkgconfig/pkg_check_modules.html

Thanks for an explanation, but I'm still missing something.
In openSUSE:

$ pkg-config --libs --cflags libkeyutils
-lkeyutils

$ pkg-config --libs --cflags keyutils-libs
Package keyutils-libs was not found in the pkg-config search path.
Perhaps you should add the directory containing `keyutils-libs.pc'
to the PKG_CONFIG_PATH environment variable
Package 'keyutils-libs', required by 'virtual:world', not found

That's correct, because keyutils-devel package has file:
/usr/lib64/pkgconfig/libkeyutils.pc

The same is for Debian, which has
/usr/lib/x86_64-linux-gnu/pkgconfig/libkeyutils.pc

Looking at Fedora:
keyutils-libs-devel [1] has /usr/lib64/pkgconfig/libkeyutils.pc.

Download and unpack the package and run:
$ PKG_CONFIG_LIBDIR="$PWD/usr/lib64/pkgconfig/" pkg-config --libs --cflags libkeyutils
-lkeyutils

> > Tested: https://travis-ci.org/github/pevik/ltp/builds/753925166


> The reason for test all get passed is the "include/lapi/keyctl.h" has the
> second choice to include <linux/keyctl.h> I guess.

> #if defined(HAVE_KEYUTILS_H) && defined(HAVE_LIBKEYUTILS)
> # include <keyutils.h>
In my case (openSUSE) I have HAVE_LIBKEYUTILS defined.
> #else
> # ifdef HAVE_LINUX_KEYCTL_H
> #  include <linux/keyctl.h>
> # endif /* HAVE_LINUX_KEYCTL_H */

Kind regards,
Petr

[1] https://download-ib01.fedoraproject.org/pub/fedora/linux/updates/33/Everything/x86_64/Packages/k/keyutils-libs-devel-1.6.1-1.fc33.x86_64.rpm